Display screen or portion thereof with transitional graphical user interface



FIG. 1 is the first image in a sequence of a display screen or portionthereof with transitional graphical user interface showing our newdesign;

FIG. 2 is the second image thereof;

FIG. 3 is the third image thereof;

FIG. 4 is the fourth image thereof;

FIG. 5 is the fifth image thereof;

FIG. 6 is another view of FIG. 1, but shown without the broken lines forclarity of illustration;

FIG. 7 is another view of FIG. 2, but shown without the broken lines forclarity of illustration;

FIG. 8 is another view of FIG. 3, but shown without the broken lines forclarity of illustration;

FIG. 9 is another view of FIG. 4, but shown without the broken lines forclarity of illustration;

FIG. 10 is another view of FIG. 5, but shown without the broken linesfor clarity of illustration;

FIG. 11 is an enlarged view of the encircled portion in FIG. 6;

FIG. 12 is an enlarged view of the encircled portion in FIG. 7;

FIG. 13 is an enlarged view of the encircled portion in FIG. 8;

FIG. 14 is an enlarged view of the encircled portion in FIG. 9; and,

FIG. 15 is an enlarged view of the encircled portion in FIG. 10.

The dash-dash broken lines in the figures showing the display screen orportion thereof form no part of the claimed design.

The remaining dash-dash broken lines in the figures showing portions ofthe transitional graphical user interface form no part of the claimeddesign.

The dot-dot-dash broken lines encircling portions of the claimed designthat are illustrated in enlargements form no part of the claimed design.

The appearance of the transitional graphical user interface sequentiallytransitions between the images shown in FIGS. 1 through 5. The processor period in which one image transitions to another forms no part of theclaimed design.

CLAIM We claim the ornamental design for a display screen or portionthereof with transitional graphical user interface, as shown anddescribed.